Beany mackerel pot

Ingredients

• 680g 'ready to eat' peppered smoked mackerel fillets, fresh or defrosted, skinned and cubed
• 1 x 15ml spoon (1 tablespoon) sunflower oil
• 1 small onion, chopped
• 1 clove garlic, crushed
• 1 yellow pepper, deseeded and cut into strips
• 1 x 200g can chopped tomatoes
• 1 x 400g can flageolet beans (or similar), drained
• 1 x 200g can baked beans
• salt and black pepper